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I'm not sure what a “zoning building code” is. Zoning codes are from a political process that basically define that you can build this and not that in a specific location. This zoning colliery also applied to types of business operations and such. Building codes are functionally engineering specifications although political drivers can influence their existence.

From what I have learned about 3D printing for housing and commercial structures, the limitations thus far have been economic, technical and wrap these two up in sociological issues. Economic comes down to $$$ per square foot. Yes, it appears that the building structure can go up in a fraction of the time but it uses very expensive printing equipment and more expensive concrete. Technical issues apparently are that building code specifications have not expanded to adequately cover this type of construction. Sociological issues circle around that the printed structure will look differently than the historical standard.